Bulldog extruder

_DSC0117, a photo by thejollygrimreaper on Flickr.

-=( New nozzle geometry )=-

After i recieved my latest batch of nozzles with a better quality orifice which now has a very tiny chamfer on the inside of the 0.3mm hole it is still compatible with the up! extruders and makerbot extruders, 

on this one i have drilled out the back to 4mm and extended the ptfe liner down into the back of the nozzle, this mean not only does the hotend not have to be sealed but also that retraction is so much more effective, 

after a little more testing i will make these the standard nozzle on the Aluhotend,

the photo below is the nozzle at operating temperature 30mins after the filament was retracted back up 7mm this will essentially make it perfect for dual extrusion setups

-=( Tip of the day #1 - Evil Heater Cartridges )=-

Don't ever take it for granted that the $4 ceramic heater cartridge is electrically isolated from it's stainless steel shell, always buy them in multiples and test them first before using them,

if your thermistor isn't as insulated as it should be or you are using multiple cartridges in a bed like i am for instance you will find it can generate a dead short, and if you run cheap power supplies like i do then you can either damage the board or blow up the power supply,

needless to say all the cartridges i now sell are tested before sale.